Universal circular arc template



July 22 1924. LSGZBZ? T. SPEIDEN UNIVERSAL CIRCULAR ARC TEMPLATE Filed June 29. {1925 2 Shams-Sheet 1 wm q ATTORNEYS WITNESSES July 2% .3924. T. SPEIDEN UNIVER$AL CIRCULAR ARC TEMPLATE Filed June 29. 1 923 2 Sheets-Sheet.

INVEJVTOR 7 Spa/05% I BY WITNESSES A TTORNE YS Patented July 22, 1924.

umren STATES THEODORE SPEIDEN, OF CHICAGO, ILLINOIS.

UNIVERSAL CIRCULAR ABC TEMPLATE.

Application filed June 29,

T 0 (ZZZ whom it may emtce'rn:

Be it known that I, Trniononn SPEIDnN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Universal Circular Arc Templates, of which the following is a specification.

This invention relates to a universal circular arc template and has for its object the provision of a devicefor drawing with a Pen l or P 1 a of ue. c r es i g. radii which may be varied from ten to sevr un re i h s- A further object of the invention is the provision of an arc template having, an adjustable means for accurately centering a pen or pencil which describes an arc and a pair of legs adapted to be guided in bearings at the end of a base plate; the centers of the bearings at the ends of the baseplate and the pen or pencil point being accurately positioned in points along the arc of the circle which is adapted to be drawn by the template.

A further object of the invention is the provision of a template fordrawing arcs of circles which will produce accurate work and which is designed to endure a great amount of use without affecting its accuracy because of wear upon the operating parts of the device.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications, which shall define no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Figure 1 is a plan view of the template constructed according to my invention. I

Figure 2 is a fragmentary View in plan detailing the angular connection of the legs of the template.

Figure?) is a vertical section of the angu lar portion of the template taken along the line 33 of Figure 2. f 'Figure 4 is a' vertical section of the angular portion of the template taken along the line 4-4 of Figure 2.

Figure 5 an enlarged fra mentary 1923. Serial no. 648,585.

View of the mounting of a leg on the end of the base plate.

Figure 6 is a view in elevation of the a e.

Figure 7 is ,a vertical section of the mountingshownin Figure 6. 7

Referring to the drawings, 1 designates a base plate having, a straight edge 2 and enlarged portions 3' at its ends forming a mounting for the bearings, through which the legs 45 and 5 are adapted. to slide. Serews 6 ofa small diameter having a threaded engagement with passages in the base plate 1 are adapted to be screwedinto I a drawing board for securing thebase P a e 1 in p si ni The outer. end of the leg 5 is provided with a circular opening 7 which is'adapted to receive a sleeve 8 and said sleeve is fitted within the opening sufliciently tight to prevent rotation of the sleeve within the opening. The lower end of the sleeve is provided with a flange 9 which prevents disengagement of the sleeve from the opening 7 in leg '5. The. adjacent end of the leg 4: is provided with an annular perforation 10 which is adapted to receive the sleeve 8 with said end of the leg located upon the adjacent end of the leg 5. r

The end o1 the leg l is split upon the 1011 gitudinalcentral line of the leg and provided with flanges 11 which are clamped together by means of a screw 12 for adjustably lockingfthe end of the leg t on the sleeve 5 and thereby maintaining a predetermined angle between the legs when the template is being operated. The flanges 11 and the screw 12 permit angular adjustment of the legs a and 5.

Mounted for rotation within'the sleeve 8 is a barrel or cylinder 13 which is adapted to form a means for holding a pen or penoil centrally of the sleeve 8 and at the vertex of the angle formed by the center lines of the legs 4: and 5 The barrel is enlarged as at- 14 to provide a shoulder which rests' upon the upper end of the sleeve 8.

An annular disc 19 adjacent the enlargement 14 closes the barrel intermediate its ends except for a rectangular passage 18 in which is adapted to be received'the' shank 17 of a pen or pencil. As shown in Figure 4 the shank is pivotally supported in the passage 18 by said screws 15 and 16. These screws are adjusted in diametrically disfposed Pa s x end ng t reeeb the @P disposed within the hollow shank 17 and adapted to be held'in a fixed position by means of a screw 23.

Each of the legs 4 and 5 are formed with a horizontal top'portion 24 and depending flanges 25 bordering opposite edges of the top portion 24 and an end depending flange 26; These flanges are provided for stiffening the legs and to prevent bending of thesame. The mounting for the'legs in which said legs are adapted to slide is shown more particularly in Figures 5, 6 and 7. V

The ends of the base plate} are enlarged as shown at 3 andprovided with a circular passage 27. The centers of these circular passages in the ends of the base plate 1 are in direct line with the straight edge 2 of said base. manner at theends of the base plate 1 and havingv a cylindrical portion 28 located in the circular passages 27 are posts 29. These posts have'annular flanges 30 which are" adapted to be secured in any approved manner as byscrews tothe ends of the baseyplate. Upon each post andresting on the flange 30 are ball bearings 31encased in At a point in the post 29;

a sleeve 32. and where the upper surface of the ball i bearing 30 terminates, said postis reduced in diameter externally to form a shoulder 33 and a reduced cylindrical portion which receives a ball bearing .O nehportion of the ball bearing rests on the shoulders 33, while the remaining portion is mounted on the ball bearing 31. g The ball bearing 34 is encased by' a sleeve 35"which isprovided. at diametrically opposite points with pairs of spaced lugs-36.

Between 'the lugs are mounted rollers .37 having conical sockets in ahnement with the axis of sald rollers for receiving the polnted ends of pivot pins 38which are screwed into threaded passages in the lugs 36. The bottom faces of the legs ride on the rollers and are held in position on said rollers by means of a plate 39 mounted upon the top of lugs 40 integrally formed with the sleeve 35. A

plate 41 is locked uponth'e end of the post 29 by means of a nut .42. Saidplate maine tains the ball bearing 34 in position on the barrel. I

The ball bearings 34 and 31 on the post 24 i provide for ready movement of the legs 4 and 5 when thetemplate is moved to produce a curve and whens-aid legs are moved in a slidingmotlon 1n thelr gulde on the end 'of'the post, said legs will ride on the rollers 34. During the sliding movement of the legs the flanges 25 will engage the inner sur faces of the upstanding niembers4O connected with the sleeve 35 and prevent lateral displacement of the legs when in motion.

A supporting member 43'is mounted for vertical adjustment in the leg 4 adjacent its connection with theleg 5 and is adapted to support the legs in a horizontal position and maintain the legs at their outer ends at the same vertical distance from the board as the inner or sliding portion of said legs. 7 In the operation of the device the base plate 1 is secured in position upon table orboard by means of the screws 6. Theset screw .12 is released'for forming the proper angle between the legs 4ja'nd5 in order to" V produce the are desired;- The radius oft-he V my improved mountin-gfor the legs 4,.and Rigidly secured in any approved 5 and the micrometer adjustment for the pen or pencil at the apex of the triangle I have.

provided a device which is not only accurate but which will not readily wear out. p In order to determine whether the pen or. pencil point is properly located within the barrel 13, said barrel is'rotated and if the point of the pen or pencil'describes a circle: the micrometer screws must'be adjusted un-y til thepencil or'pen fails to disclose anything more than a single point wherethe barrel 13' IN is revolved. e

What I Claim is'z" 7 1. An arc template comprising a base member adapted to be secured to fixed support,-'legs pivotally and slidably mounted intermediate their ends at the ends of the base member, means for removably lock-Q ing the ends of the legs to: form a predetermined angle, means forrpivotally supporting an are describing element at the vertexof'the angle formed by the connected legs, and cooperating means for adjusting the arcdescribing element through an arc ofa circle. V I I 21in, arc template'comprising a base member adapted to bese-cured to a fixed support, legs pivotally and slida'bly mounted intermediate their ends at the ends of; the base member, .means for, removably locking the ends of the, legs to form a predetermined angle between the legs, means forsupporting an arc describing element at the vertex of the angle formed the connected legs, said, last, mentioned means comprising a sleeveisupported by the connected legs, a post rotatably mountedwith-in said sleeve and having narrow passage therethrough to rec-eivethefarc describing element, and means for locking thearc describing element centrally of the rotatable post. p

3, .An. are template comprising a base the are describing elementjin the" post.

4. An are template com rising a base member adapted to be secured to fixed supperniieg's pivotally and slidably mount e'ol intermediate their nds at the ends of theflbas'e member,a' free end of one of the legs being provided with a perforation, a sleeve ni'oun'ted in" the perforation and pro vided with aclateral flange upon which the perforated end of the leg is seated, the free end of the second leg being perforated and severed at one portion to provide a split ring, ears projecting from the ends. of the split ring, said ring adapted to receive the sleeve and rest upon the perforated end of the first mentioned leg, means for clamping the ears together for rigidly locking the end of the second leg to the sleeve,-and means rotatably mounted in the sleeve for supporting an are describing element cen trally of the sleeve. I

5. An arc template comprising a base member adapted to be secured to a fixed support, legs pivotally and slidably mounted intermediate their ends at the ends of the base member, the free end of one of the legs being provided with a perforation, a sleeve mounted in the perforation and provided with a lateral flange upon which the .perforated end of the leg is seated, the free endof the second leg being perforated and severed at one portion to provide a split ring, ears projecting from the ends of the split ring, said ring adapted to receive the sleeve and rest upon the perforated end of the first mentioned leg, means for clamping the ears together for rigidly locking the end of the secondleg to the sleeve, a post rotatably mounted in the sleeve and having an annular shoulder bearing upon the upper end of the sleeve, and means mounted in the post for locking an are describing element at the vertex of the angle formed by the connected legs. I

6. An arc template comprising a base member adapted to be secured to a fixed support, legs pivotally and slidably mounted intermediate their ends at the ends of the base member, a free end of one of the legs being provided'with a perforation, a"

sleeve mounted in the perforation and pro vided with a lateral flange upon which the perforated end of the leg is seated, the free end of the second legbeing perforated and severed atone portion to provide a split ring, ears projecting from the ends of the split ring, said ring adapted to receive the sleeve and rest upon the perforated end of the: first mentioned leg, means for clamping the ears together for rigidly locking the end of the second leg to the sleeve, a post rotatably; mounted in the sleeve and having an annular shoulder bearing upon the upper end of thesleeve, and adjustable means for centering and supporting an are describing element at the apex of the angle formed by lines drawn longitudinal y and centrally of the legs, 7

.7. An arc template comprising a base member adapted to be'se'cure'd to" a fixed support, legs having an "end of one adjustably secured to'the end of theot-her leg means for pivotally and slida'bly mountingthe legs at the ends of the base member, said last mentioned means comprising a hol-' low post secured to the ends of the base member, a. sleeve mounted for rotation on the fixed post, and a guide mounted on the upiper end of the post and adapted to receive a eg.

8. An arc template comprising a base ,member adaptedto be secured to a fixed support, legs having an end of one adjustably secured to the end of the other leg, means for pivotally and slidably mounting the legs at the ends of the base member, said last mentioned means comprising a hollow post secured to the ends of the base member, roller bearings mounted for rotation on the fixed post, and a guide rotatably mounted on'the upper end of the post for permitting pivotal and sliding movement of the leg.

9. An arc template comprising a base member adapted to be secured to a fixed support, legs having an end of one adjustably secured to the end of the other leg, means for pivotally and slidably mounting the legs at the ends of the base member, said last mentioned means comprising a post rigidly mounted on the ends of the base plate, a pair of ball bearings mounted for rotation on the post, lugs projecting upwardly from one of the ball bearings, a plate connecting the upper ends of the lugs and cooperating with the lugs to form a guide for receiving and permitting sliding movement of a leg, and likewise pivotal movement of said leg, and means for locking the ball bearings in position on the post.

10. An arc template comprising a base member adapted to be secured to a fixed support, legs having an end of one adjustably secured to the end of the other leg, means for pivotally and slidably mounting the legs .mounted on said roller bearing to receive the legs, said legs being slidable on the rollers mounted in the pairs of lugs.

11. An arc template comprising a base member adapted to besecured to a fixed sup-. port, legs having an end of one adjustably secured to the end of the other leg, means for'pivot'ally and. slidably mounting the legs at. the ends of the base member, said last mentioned means comprising posts rigidly connected at each end of the base member,

roller bearings mountedlon the post in superposed relation, the :upper roller bear ing being provided With a pair of upstanding lugs, a plate connecting the lugs and cooperatingv with the lugs to form a guide to receive a leg, a disc mounted in the post in engagement with the uppermost ball bearmg, and a nut'having athreaded engagement with the post for lockmg the CllSCdIl position.

12. An are template comprising a base; member adapted to be secured to a fixed support, legs having an end of one adjustablv secured to the end of the other leg, means, for pivotally and, slidably mounting the at the ends ofthe base member, said lastmentioned meanscomprising posts rigleg idly connected at each endof the base member, roller oearmgs mounted on the post in superposed relatlon, the upper roller bearing being provided with a pair of upstanding lugs, a plate connecting the lugs and cov operating W th the; lugs to form a guide-to receive a leg, .a disc mounted inthe postin engagement Withthe uppermost ball bear ing, a nutli-aving threaded engagement with, the post forlocking the disc in posij tion, said bearings being provided Wltl'LOpr positely projectin pairs, of ears, rollers mounted in the ears and engaging the under face of the legs.

THEODORE srnmnn 

